But in a dramatic twist, Oswald was himself shot dead two days later by Jack Ruby while he was in custody after being charged with Kennedy’s murder.

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JFK: The president was killed in Dallas, Texas, in 1963

JFK assassination CONSPIRACY: What really happened the to US President?

While Lee Harvey Oswald was posthumously blamed for the shooting of John F Kennedy, conspiracy theorists believe the was just a patsy. A range of theories have developed over the years, with some blaming Fidel Castro, the CIA or the Mafia for the killing. In total, Former Los Angeles District Attorney Vincent Bugliosi estimated that a total of 42 groups, 82 assassins, and 214 people have been linked to the killing

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Bystanders look on as Jacqueline Kennedy reaches over to help her husband, American President John F. Kennedy who lies on the rear of a car after being struck by an assassin's bullet

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MURDER: JFK was shot by Lee Harvey Oswald

The iconic president’s death spawned numerous wild conspiracy theories, which could be dispelled when they are released.

Dr Sabato, however, believes that some mysteries will remain, despite Donald Trump’s pledge to release most of the files.

He said: “I think if you are looking long term, we will find any document that really points us in the direction of anyone but Lee Harvey Oswald.

“That may be because Lee Harvey Oswald was the only assassin. It may also be because key documents were probably destroyed in the 1960’s and particularly the 1970s when Congress took up where the warrant commission stopped.

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SHOOTER: Lee Harvey Oswald is widely believed to have acted alone

JFK spotted in London

An iconic 1960’s motorcade has dramatically made its way through London. Bystanders were shocked and amazed as the passengers appeared to be John F Kennedy and his glamorous wife Jackie. The motorcade, which carried uncanny lookalikes of the assassinated American president and his first lady inside their Lincoln Limousine, flanked by authentic motorbikes and period cars, was staged by celebrity lookalike photographer Alison Jackson

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Alison Jackson

Alison Jackson brings JFK back to life in London with a full Presidential motorcade

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SHOT DEAD: Lee Harvey Oswald was himself shot

“There were a lot of loose ends. Just to pick up on one of them, Jack Ruby. He was considered a hero at the time. Had he not shot Oswald we would have gotten to the key questions which was, ‘what was his motive?’”

He added: “It still isn’t clear, it doesn’t make sense to most people who knew Oswald. We will never know because he was killed after the original assassination of president Kennedy.”